Detecting internet connection

Question

Hello! I've searched these forums for an answer to this question and found one that didn't work on my system (using Wintel.dll) http://216.26.160.137/Forums/AspNetForums20/ShowPost.aspx?PostID=51 It says that I am connected always even when I am not. and the returned connectionflag is always 81 no matter what my connectionstate is. I want to write a program that checks how much time my fiancee and I use on the internet. I have a dial up connection and would like a program wich resides in the background and pops up when a connection to the internet is detected. I would like to be able to write a method that looks like this: public static bool IsModemConnectedToTheInternet() Can anyone help me? Y.S. /Rickard Haake

haake · Answer

It works when looking for a connection but it will also poll when the connection is there and will wait for the connection to go down. This is the problem it checks the response a couple of times then hangs (When there is a connection) What I need is the following. I am going to write a program that counts the time I am connected to the internet using a dial up modem. The best solution is if windows fires an event that I can listen to and react to both when the modem is connected and when the modem gets disconnected. The other solution is that I will ask the system if the dial up connection is active once every second or so so the method to do this must be as fast as possible and preferably not use any modem bandwidth. /Rickard Haake

james · Answer

/// /// Pass in a URL to test a connection to. /// /// /// public bool Exists(string URL) { // if the URL is not formed as a website URL format it properly for the HttpWebRequest if(URL.ToUpper().IndexOf(HTTP://) != 0) { URL = http:// + URL; } bool tmpbool = false; try { WebRequest tmpwebreq = HttpWebRequest.Create(URL); HttpWebResponse tmpwebres = (HttpWebResponse)tmpwebreq.GetResponse(); if(tmpwebres.StatusCode == System.Net.HttpStatusCode.OK) { tmpbool = true; } } catch(Exception) { tmpbool = false; } return tmpbool; }